Self-locking nut washer



Dec'. 8, 1936. a MILLER I 2,063,181 7 SELF LOCKING NUT WASHER Original Filed Nov. 22, 1930 A? Jig.

7 7 Z Jwovnto'v 6; [7i zzer Patented Dec. 8, 1936 UNITED STATES SELF-LOOKING NUT WASHER Glenmore Miller, Pontiac, Mich.

Application November 22, 1930, Serlal'No. 497,541 Renewed March 5, 1936 2 Claims. g (01. 85-32) This invention relates to nuts and bolts and particularly to a self-locking nut washer. The general object of this invention is to provide a combined nut and washer so formed that it may be applied to a screw or a bolt and so formed that as the screw or bolt is turned the nut or washer will be forced into engagement with the work and at the same time will automatically tighten upon the bolt to an extent which will hold the bolt or screw from loosening, but which, will not prevent the bolt or screw from being removed upon the application of proper force thereto.

A further object is to provide a device of this kind in which the nut washer is initially curved and as the screw or bolt is turned, the nut washer wlllflatten and as it flattens will bind upon the screw or bolt and also bite upon the screw or bolt and also bite into the work.

My invention is illustrated in the accompanying drawing, wherein:-- v

Figure 1 is a sectional view through a piece of work with my nut washer applied to the bolt therein;

. Figure 2 is a longitudinal sectional view through the nut washer on the line 2-2 of Figure 3;

Figure 3 is a top plan view.

Referring to this drawing. Ill designates a strip of metal having at its corners the prongs ll.

This strip is initially slitted at I! to provide two opposed tongues l3. These tongues at their ends are turned outward as at It and these outwardly turnedportionswhichare arcuate in cross section, are interiorly screw-threaded as at I. The plate or strip llisinitially curved andmaybemade resilient or of shape-retentive material. when the screw or bolt I 6 is inserted through the work A,"

it engages the screw-threads of the outwardly turned portions l4 and then astthe screw is turned,--the plate or strip ll willbe gradually flattened, forcing the prongs ll into the work and the gradual flattening of the plate will cause "the screw-threaded portions It to be forced toward each other and to bind upon the screw or bolt. This deflection of the plate Ill brings the threads on the portions it absolutely square with the thread on the bolt 61- screw, but so tightens this nut washer upon the bolt or screw that the 5 bolt cannot become readily disengaged, but-must. be positively rotated in order to unscrew it fromits engagement with this nut washer.

I claim:-

1. A nut of the character described, formed 10 V of a relatively thin sheet metal plate, the middle of the plate being formed to provide two opposed longitudinally extending tongues defined by longitudinally extending slits, a cross slitbetween the tongues, each tongue at its inner end being 15 extended outward in a direction away from the plate and at right angles thereto and each out wardly extending portion being transversely eoncave on its inner face, these concave faces being screw-threaded and the threads extendingthe 2 length of each portion, the tongues being initially disposed in inclined planes relative to the plate and convergently with reference to each other, the angular extremities of the tongues being initiaily disposed in angular relation to each other whereby when the tongues are forced toward the plane of the plate, the screw-threaded end faces of the tongues will be forced into engagement with the work and the angular extremities of the tongues will be brought into approximately par- 30 allel relation to each other. I

2. A spring nut comprising a base portion of sheet metal having spring-like and having a pair of tongues struck upwardly from the base portion intermediate the ends 35 thereof and in opposition to each other, the tonguesterminating in spaced curved portions, eachhavingtheinnersurfaeethereofthreaded. and thethreadsononepartcoactingwiththoee, oftheotherparttofltthethreadsofaboltthat 40 is inserted therethrough- 

